refactor: require explicit action handlers and save-change channel in main screens

- Update `AdaptiveMainScreen` and `NoteDetailScreen` to require `onAction` callbacks and `checkSaveChangeChannel` as parameters, removing their default values.
- Pass `checkSaveChangeChannel` from `NoteViewModel` through the adaptive scaffold to the detail pane.
- Update `ScreenshootPreview` to provide the required arguments for the updated `AdaptiveMainScreen` signature.
- Remove unused `SnackbarHostState` from the main screen preview.

Author: softartdev

app/android/src/main/java/com/softartdev/notedelight/ScreenshootPreview.kt

@@ -3,7 +3,6 @@ package com.softartdev.notedelight
 import android.content.res.Configuration
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.text.input.TextFieldState
-import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Surface
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.MutableState
@@ -26,6 +25,7 @@ import com.softartdev.notedelight.ui.main.NoteDetailBody
 import com.softartdev.notedelight.ui.settings.AdaptiveSettingsScreen
 import com.softartdev.notedelight.ui.signin.SignInScreenBody
 import com.softartdev.theme.material3.PreferableMaterialTheme
+import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.flow.flowOf
 import kotlinx.datetime.LocalDateTime
 
@@ -147,7 +147,9 @@ private fun StoreNotesScreen() {
     AdaptiveMainScreen(
         noteListResultState = noteListState,
         noteDetailState = remember { mutableStateOf(NoteResult(note = selectedNote)) },
-        snackbarHostState = remember { SnackbarHostState() },
+        onMainAction = {},
+        onNoteAction = {},
+        checkSaveChangeChannel = Channel()
     )
 }
 

core/ui/src/commonMain/kotlin/com/softartdev/notedelight/ui/main/AdaptiveMainScreen.kt

@@ -32,6 +32,7 @@ import com.softartdev.notedelight.presentation.note.NoteViewModel
 import com.softartdev.notedelight.ui.NavBackHandler
 import com.softartdev.notedelight.ui.VerticalPaneExpansionDragHandle
 import com.softartdev.theme.material3.PreferableMaterialTheme
+import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.launch
 import org.koin.compose.koinInject
 import org.koin.compose.viewmodel.koinViewModel
@@ -53,7 +54,8 @@ fun AdaptiveMainScreen(
         noteListResultState = mainViewModel.stateFlow.collectAsState(),
         onMainAction = mainViewModel::onAction,
         noteDetailState = noteViewModel.stateFlow.collectAsState(),
-        onNoteAction = noteViewModel::onAction
+        onNoteAction = noteViewModel::onAction,
+        checkSaveChangeChannel = noteViewModel.checkSaveChangeChannel
     )
 }
 
@@ -62,9 +64,10 @@ fun AdaptiveMainScreen(
     router: Router = koinInject(),
     snackbarHostState: SnackbarHostState = SnackbarHostState(),
     noteListResultState: State<NoteListResult>,
-    onMainAction: (action: MainAction) -> Unit = {},
+    onMainAction: (action: MainAction) -> Unit,
     noteDetailState: State<NoteResult>,
-    onNoteAction: (action: NoteAction) -> Unit = {},
+    onNoteAction: (action: NoteAction) -> Unit,
+    checkSaveChangeChannel: Channel<Unit>
 ) {
     val coroutineScope = rememberCoroutineScope()
     val navigator: ThreePaneScaffoldNavigator<Long> = rememberListDetailPaneScaffoldNavigator<Long>()
@@ -78,7 +81,7 @@ fun AdaptiveMainScreen(
         directive = navigator.scaffoldDirective,
         value = navigator.scaffoldValue,
         listPane = { MainScreen(noteListResultState, onMainAction, snackbarHostState = snackbarHostState) },
-        detailPane = { NoteDetailScreen(noteDetailState, onNoteAction) },
+        detailPane = { NoteDetailScreen(noteDetailState, onNoteAction, checkSaveChangeChannel) },
         paneExpansionDragHandle = ThreePaneScaffoldScope::VerticalPaneExpansionDragHandle,
         paneExpansionState = paneExpansionState
     )

core/ui/src/commonMain/kotlin/com/softartdev/notedelight/ui/main/NoteDetail.kt

@@ -68,8 +68,8 @@ fun NoteDetail(noteViewModel: NoteViewModel) {
 @Composable
 fun NoteDetailScreen(
     noteDetailState: State<NoteResult>,
-    onAction: (NoteAction) -> Unit = {},
-    checkSaveChangeChannel: Channel<Unit> = Channel()
+    onAction: (NoteAction) -> Unit,
+    checkSaveChangeChannel: Channel<Unit>
 ) = when (noteDetailState.value.note) {
     null -> MainDetailPanePlaceholder()
     else -> NoteDetail(